CSV阅读器重复阅读1行

Question

我有一个csv.reader读取文件，但是反复读取同一行。

import csv

with open('mydata.csv', 'rb') as f:
    reader = csv.reader(f)
    reader.next()
    for row in reader:
        while i < 10:
            print row
            i=i+1

该代码将第二行打印10次（因为我想跳过标题）。

Answer 1

您的代码完全按照您的要求进行操作...（而且，您的标题具有误导性：读者只读取该行一次，您只是将其打印10次）

reader.next() # advances to second line
for row in reader: # loops over remaining lines
    while i < 10: # loops over i
        print row # prints current row - this would be the second row in the first forloop iteration... 10 times, because you loop over i.
        i=i+1 # increments i, so the next rows, i is already >=10, your while-loop only affects the second line.

为什么首先要有while循环？ 您可以轻松地执行以下操作：

   reader = csv.reader(f)
   for rownum, row in enumerate(reader):
     if rownum: #skip first line
        print row